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  3. What is the most important service of trees to man according to the passage? Why did the country mentioned in the passage suffe

What is the most important service of trees to man according to the passage? Why did the country mentioned in the passage suffe

admin2008-11-13  22
问题 What is the most important service of trees to man according to the passage?
Why did the country mentioned in the passage suffer from floods and starvation?
选项 A、Because an empire was set up.
B、Because the empire fell to pieces.
C、Because it lost all its trees.
D、Because too much had been spent on wars.
答案C
解析 本题考查的是考生推理能力及对细节的把握。答案对应文章的第三段，其中提到失去树木后，雨水会导致水灾并且冲走了富饶的上层泥土。上层泥土冲走后就只留下贫瘠的沙漠。贫瘠的土壤是导致饥荒的原因。因此，失去树木是导致水灾和饥荒的根源。
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